Influence of photosynthesis inhibitors on chlorophyll content in redroot pigweed and lettuce
DOI:
https://doi.org/10.7251/ZARS2301145MKeywords:
metribuzin, metamiton, redroot pigweed (Amaranthus retroflexus L.), lettuce (Lactuca sativa L.), chlorophyll contentAbstract
The aim of this study was to determine the effect of different concentrations of herbicides inhibitors of photosynthesis, , on the chlorophyll content two test plants: redroot pigweed (Amaranthus retroflexus L.) and lettuce (Lactuca sativa L.). Two herbicides Dancor 70 WG (a. s. metribuzin 700 g/kg) and Goltix 70 SC (a. s. metamitron 700 g/L) were applied. Five different concentrations were used and compared with the untreated control. The relative content of chlorophyll in the leaves of the treated plants was measured by chlorophyllometer SPAD 502. In both test plants, significant phytotoxic reactions were observed 7 days after herbicides application. Phytotoxicity on redroot pigweed manifested in the form of burning of the edge of the leaf and twisting towards the reverse side, depigmentation and drying of smaller leaves. On the lettuce, necrosis appeared from the top to the base of the leaf. The regression relationship between the percentage content of chlorophyll in the leaves of redroot pigweed and the applied concentration of both herbicides corresponds to a linear regression function (decreasing function), and for lettuce this relationship corresponds to an exponential function of the first order (decreasing function). Applied effective doses of metribuzin and metamitron showed that lettuce is more sensible than redroot pigweed. Also, a.s. metribuzin is more effective than a.s. metamitron in the reduction of chlorophyll content, for both researched species.
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